Skimming this thread somewhat - I believe the RDF Datatypes design is
meant to be open to non-XML Schema datatypes defined by fiat, which may
allow a WG to do what Bijan appears to be discussing - e.g. define an
owl:integer an owl:real, owl:rational, owl:complex datatypes ....
It may even allow for an owl:real datatype whose value space includes
all the reals, even those that can't be written down.
It would be another little project though, probably out-of-charter
(certainly, if the timeline is taken into account).
Jeremy